Initial pass at message content rendering

Tusker/Views/StatusTableViewCell.swift

@@ -16,14 +16,100 @@ class StatusTableViewCell: UITableViewCell {
     @IBOutlet weak var usernameLabel: UILabel!
     @IBOutlet weak var contentLabel: UILabel!
     
+    var status: Status!
+    
+    var layoutManager: NSLayoutManager!
+    var textContainer: NSTextContainer!
+    var textStorage: NSTextStorage!
+    
+    var links: [NSRange: URL] = [:]
+    
     func updateUI(for status: Status) {
-        displayNameLabel.text = status.account.displayName
-        usernameLabel.text = "@\(status.account.acct)"
+        self.status = status
+        
+        let account: Account
+        if let reblog = status.reblog {
+            account = reblog.account
+        } else {
+            account = status.account
+        }
+        displayNameLabel.text = account.displayName
+        usernameLabel.text = "@\(account.acct)"
         
         let doc = try! SwiftSoup.parse(status.content)
-        let text = (try! doc.body()?.text())!
+        let body = doc.body()!
+        print("---")
+        print(status.content)
+        print("---")
         
-        contentLabel.text = text
+        let text = attributedTextForNode(body)
+        contentLabel.attributedText = text
+        contentLabel.isUserInteractionEnabled = true
+        contentLabel.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTapOnContentLabel(_:))))
+        
+        // https://stackoverflow.com/a/28519273/4731558
+        layoutManager = NSLayoutManager()
+        textContainer = NSTextContainer(size: .zero)
+        textStorage = NSTextStorage(attributedString: text)
+        
+        layoutManager.addTextContainer(textContainer)
+        textStorage.addLayoutManager(layoutManager)
+        
+        textContainer.lineFragmentPadding = 0
+        textContainer.lineBreakMode = contentLabel.lineBreakMode
+        textContainer.maximumNumberOfLines = contentLabel.numberOfLines
+    }
+
+    func attributedTextForNode(_ node: Node) -> NSAttributedString {
+        switch node {
+        case let node as TextNode:
+            return NSAttributedString(string: node.text())
+        case let node as Element:
+            let attributed = NSMutableAttributedString()
+            node.getChildNodes().forEach { child in
+                attributed.append(attributedTextForNode(child))
+            }
+            
+            switch node.tagName() {
+            case "br":
+                attributed.append(NSAttributedString(string: "\n"))
+            case "a":
+                let linkRange = NSRange(location: 0, length: attributed.length)
+                let linkAttributes: [NSAttributedString.Key: Any] = [
+                    .foregroundColor: UIColor.blue
+                ]
+                attributed.setAttributes(linkAttributes, range: linkRange)
+                let link = try! node.attr("href")
+                links[linkRange] = URL(string: link)!
+            default:
+                break
+            }
+            
+            return attributed
+        default:
+            fatalError("Unexpected node type: \(type(of: node))")
+        }
+    }
+    
+    @objc func handleTapOnContentLabel(_ tapGesture: UITapGestureRecognizer) {
+        guard let view = tapGesture.view else { fatalError() }
+        
+        let locationOfTouchInLabel = tapGesture.location(in: view)
+        let labelSize = view.bounds.size
+        let textBoundingBox = layoutManager.usedRect(for: textContainer)
+        let textContainerOffset = CGPoint(x: (labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
+                                          y: (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y)
+        let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x,
+                                                     y: locationOfTouchInLabel.y - textContainerOffset.y)
+        let indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
+        
+        let link = links.first { (range, _) -> Bool in
+            range.contains(indexOfCharacter)
+        }
+        
+        if let (_, url) = link {
+            print("Open URL: \(url)")
+        }
     }
 
 }